We examined structures for coastal dike with concrete armors resilient to tsunami overflow by conducting large-scale model experiments. Infiltration from the seaward toe raised seepage surface in the embankment soil, increasing air pressure in the space enclosed with concrete armors. Besides this, pressure under the concrete armors rose higher in the saturated part of the embankment soil, and filter layer under the concrete armor would accelerate saturation in the embankment soil. High pressure under the landward slope armor may reduce friction force between the landward slope armor and the embankment soil, resulting damages to the landward slope toe. Sheet piles can mitigate movement of the foundation at the landward toe, and concrete subslab under the landward slope armor can reduce washout of the embankment soil.
